importer has confused me about my ECU.

solo_ryder · Post by **solo_ryder** » April 1st, 2009, 4:07 pm

Just got my ZE chipped ecu in, fan is still coming on.. sigh. Gonna have to try rx8's method soon

So far it feels as useless as the k801 ecu haha. Everytime I chip a ecu I am never surprised with anything... no gains in power, bleehhhhh.

Oh well, no CEL and better mileage is a plus

Whisper · Post by **Whisper** » April 1st, 2009, 5:19 pm

Yeah, I can't really say I felt much difference switching from stock K8-34 to chipped, maybe running a little leaner with better gas mileage. Possibly correct VRIS points make some difference in power, but it's hard to tell without a dyno.

solo_ryder · Post by **solo_ryder** » April 1st, 2009, 5:41 pm

Yea.. well I chipped it mostly for fuel mileage reasons I guess. I don't notice VRIS stuff at all. Not sure why people talk about it so much. I just put my 17s on too though so that probably doesn't help acceleration

Daninski · Post by **Daninski** » April 1st, 2009, 8:36 pm

I'll be swaping a 96 K8 over to a 92. My buddy has a friend who claims he beat the fan issue by wiring in both to the one sensor. I'm sceptical. I have the green sensor on my ZE and I'm not using it. If you need me to trace the green sensor wires let me know. I thought they just went to the fan itself. The ECU is not in the picture. I'll check my 92 anyway because I'm curious. I'll tell ya, fans running all the time really blows.

Whisper · Post by **Whisper** » April 1st, 2009, 9:49 pm

Sensor wires go to the ECU, and then ECU controls the fan relays.

RX8SE3P · Post by **RX8SE3P** » April 2nd, 2009, 1:46 am

Yeah the ECU is basically looking for a second sensor because the eprom chip on it is telling it to do so.

Only way to get around it is to wire up to the correct spot on the ECU as I posted before. Then get that wire and hook it up to the plug along with a ground source. It's really not that hard.

projectzemx3 · Post by **projectzemx3** » April 2nd, 2009, 10:52 am

im pretty sure that when you get your ecu chipped. it just re-maps what the ecu already knows... it doesnt actually make it a klze ecu. so my stock ecu doesnt know about that second coolant sensor, and it never will. i dont think probinators chip changes it to think there is supposed to be a sensor there.

solo_ryder · Post by **solo_ryder** » April 2nd, 2009, 12:22 pm

Apparently it does, cause I just put in my ecu yesterday and what do you know, fans still going off like a mad man

RX8SE3P · Post by **RX8SE3P** » April 3rd, 2009, 2:59 am

Lol it does actually change the eprom chip so it's basically a KL31. That's why it looks for the second sensor.

1995 MX3 ECU - no problems
1995 MX3 ECU chipped - Fans on constantly

1994 KLDE ECU - no problems
1994 KLDE ECU chipped to KL31 - Fans on constantly

I've tried it, I've experienced it, as has Solo Ryder now too. The chip makes it into a 1993 double coolant sensing KL31. There's no real way around it as far as chips go.

You can always try using a 1994 KLDE ECU and a KL02 VAF. I'm gonna try this very soon to see if there is any power difference.

I can imagine the VRIS will be off. But apart from that it shouldn't be too different. I can't understand why none of the chippers have simply modified a KLDE eprom to give correct VRIS points, fuel timing etc but only require 1 coolant sensor.

projectzemx3 · Post by **projectzemx3** » April 3rd, 2009, 8:08 pm

hm so i should just go buy a yellow 3 plug ecu. ill be pluggin it in in the parkin lot i buy it in so if it doesnt work then ill know right away.

RX8SE3P · Post by **RX8SE3P** » April 3rd, 2009, 9:58 pm

If your engine is warm, the fans will come on instantly and never turn off. So yeah you'll know quite quickly if there is a problem.

And yeah any 3 plug OBDI ECU (all OBDI are 3 plug) will fit your wiring loom.

projectzemx3 · Post by **projectzemx3** » April 4th, 2009, 12:28 am

that sucks! but o well.

alexskull75 · Post by **alexskull75** » April 12th, 2009, 4:08 pm

hi, my mx3 it's '94 but still obd1 and work with one only thermosensor for the fans control. the klze that i bought and installed has the same fans control with one only sensor... now i know why the fans are constantly on when i put the kl31 ecu obviously when i put back the k8 ecu ... all work fine . now my question is... where i can find a klze ecu able to work with one only sensor? I also thought to swap coolant filler neck with the 3 sensor(from a vrecked '92 mx3) with only the entire wiring harness attached to the C247 yellow central connector but i am not sure if the other two kl31 yellow ecu connectors has the same pin's position of the '94. guys... do you think that it's a possible solution?

solo_ryder · Post by **solo_ryder** » April 12th, 2009, 4:22 pm

There is no ecu for a klze compatible with the one sensor.

alexskull75 · Post by **alexskull75** » April 12th, 2009, 5:14 pm

my klze has the kl 31-101 kl31-1a1 heads and the kl-31 cams but there's not the 3' sensor on the coolant filler neck like others i already seen. is it an engine without an ecu able to manage it? in your opinion can i try to swap my coolant filler neck with an earlier type with the missing sensor and its wiring attached to the central yellow connector? i afraid that the other 2 ecu connector of my '94 wiring has a different pin position. thanks a lot for your help

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